However , Kennedy 's assassination Killing is still the subject of widespread debate Quarreling and has spawned numerous conspiracy theories and alternative scenarios .

Despite some theories that the plane may have been the victim of sabotage , poor maintenance , or in-flight fire , investigators could not find Know enough evidence to support Supporting any definite conclusion .

Åke Sellström , the leader of the UN Mission , characterized Statement government explanations of rebel chemical weapons acquisition as unconvincing , resting in part upon `` poor theories '' .

Much like his brother 's assassination Killing , Robert Kennedy 's assassination Killing has led to Causation a number of conspiracy theories ; to date , no credible evidence has emerged Coming_to_be that Sirhan was not the shooter , or that he did n't act alone .

An inquiry chaired by a Supreme Court judge closely examined Testing three different theories but found Know there was insufficient evidence to determine any one of them as the cause .

At various stages of the investigation Criminal_investigation , possible hijacking Kidnapping scenarios were considered , including crew involvement , and suspicion of the airplane 's cargo manifest ; many unofficial theories have also been proposed Statement by the media .

The cause Causation of the accident is yet to be specified Statement , yet multiple theories for it exist .

Scholars have proposed Statement several theories for the Royal Yugoslav Army 's sudden collapse , including poor training Education_teaching and equipment , generals eager to secure a quick cessation of hostilities , and a sizeable Croatian nationalist fifth column .

Several conspiracy theories about the crash Catastrophe have since appeared Coming_to_be in Russian media , including that the aircraft was followed by a Ukrainian military jet .

A cause has never been established Building , and theories include Cause_to_be_included suicide , that he may have been distracted , or that he was affected by conditions such as transient global amnesia or akinesis with mutism .

Despite extensive investigations Scrutiny , the perpetrator was never identified Check , and various theories on the killer 's identity have been presented Presence over the years .

A comprehensive search Scouring of a wide area ( including what is now known to have been the crash Catastrophe site ) was fruitless , and the fate of the aircraft and its occupants remained unknown for over 50 years , giving rise Causation to various conspiracy theories about its disappearance .

The case remains Temporary_stay unsolved Resolve_problem and has given rise to Causation conspiracy theories .